@import url("//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css");

/* BootCDN
稳定、快速、免费的前端开源项目 CDN 加速服务
共收录了 4060 个前端开源项目 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "PingFang SC",Arial,"Microsoft YaHei",sans-serif;
    line-height: 1.5;
}

h1 {
    font-size: 32px;
    line-height: 1.2;
    margin-bottom: 10px;
}

h2 {
    font-size: 20px;
    font-weight: 200;
}

a {
    text-decoration: none;
}

html {
    scroll-behavior: smooth;
}

.showcase {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    
}

.video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: blanchedalmond url(/bootstrap5.1demo/bootstrap5.1demo/BootCDN+bootstrap5+html5+uiku/img/cover.jpg) no-repeat center center/cover;
    z-index: -1;
    overflow: hidden;
}

.video-container::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color:rgba(0, 0, 0, 0.6);
    background-image: linear-gradient( 0deg , rgba(0, 0, 0, 0.6), transparent);
}


.video-container video {
    min-width: 100%;
    min-height: 100%;
    object-fit: cover;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}


.btn {
    display: inline-block;
    color: #fff;
    font-size: 14px;
    padding: 10px 20px ;
    border: 1px solid #fff;
    margin-top: 20px;
    border-radius: 5px;
    letter-spacing: 2px;
    transition: .2s;
}
.ahpro {
    width: 20px;
    height: 30px;

}

.btn:hover {
    transform: scale(.9);
    backdrop-filter: blur(5px);
}

#about {
    text-align: center;
    padding: 40px;
}

#about h2 {
    margin: 20px 0;
}

#about a  {
    margin: 0 5px;
    color: #3a4052;
}